I also find many more profiles that are just GedCom imports (only one change in history) with no further edits similar to what Mary said. It seems like the bar to edit those profiles could be lowered, but that is a other story.
In regards to serious data problems, I start by adding references (with links where available, preferably free) to that profile and to the nearby relatives. I like to surround the profile with as many data points as I can. I also add a Research Notes section to explain non-obvious conclusions. Then I reach out to the Profile Manager and let them know what I changed and why when I do major restructuring (change parents and wives, children). I have only done this on lines I have been researching for years. In my case they were over 200 years old so waiting for rights was not required. I have probably have been lucky to date as the profiles I have done this with were unattended gedcom imports.
At times there was a rush, when doing this, at other times it was a pain. It was intriguing to see what had caused people to go down the wrong rat hole. One major source of confusion was an conclusion that was correct but in an such an odd place that people missed it a Family History book (The Porterfields). An other source of error was thinking Urquhart and Farquar were the same person - I kind of get that - I guess. Then there were two John Porterfields reportedly born in the same year that died with in a year of each other. They were third cousins. This research is like a scavenger hunt version of a logic puzzle, where you not only have to solve the puzzle but you have to go find the clues yourselves. Very addicting. WikiTree is ruining all my other hobbies.
